Struts2.2 Type Conversion
Struts2 的转换器：
如果Action 是PO 类（PO ：就是Action 没有继承或实现任何父类或接口），即使转换过程发生了错误，Struts 还会继续执行，跳转配置页面
只要实现了ValidationAware 接口，转换过程出错后才会返回配置的输入页面，需要实现哪些接口方法？这里只需要继承ActionSupport 这个类，如果必要只要实现Validate 这个方法即可，因为此类已经实现了ValidationAware 接口
实现TypeConvert 接口：接口参数较多，需要手动判断转换类型;
继承DefaultTypeConvert ：需要手动判断转换类型;
继承StrutsTypeConvert ：针对不同转换提供转换接口;
局部注册：
注册文件
1、名称： Action类名-conversion.properties
2、以key=value的方式指定属性的转换类，fullName=com.iflytek.convert. MyPointConverter，注意这里的fullName是需要转换的类的全名称，加包名，value是对转换类进行处理的Action
3、 将此文件放置在与Action同目录的包路径中
全局注册：
注册文件
1、名称： xwork-conversion.properties
2、以key-value的方式指定属性的转换类，例;
org.lxh.convert.Point = com.iflytek.convert.MyPointConverter
key 不能是属性 ， 而是一个全限定名称的类 ， 可以放置多个配置值对
3 、 将此文件放置 web-inf/classes 目录下
Ok ，直接上代码：
TestAction.java:
package com.iflytek.action;
import java.awt.Point;
import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;
/**
* @author xudongwang 2011-10-31
*
*/
public class TestAction extends ActionSupport {
//http://localhost:8080/Struts2.2_TypeConversion/test?name=2&age=1&date=1988-09-09&p=3,2
private String name;
private int age;
private Date date;
private Point p;
@Override
public String execute() throws Exception {
return super.execute();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public Point getP() {
return p;
}
public void setP(Point p) {
this.p = p;
}
}
MyPointConverter.java( 继承StrutsTypeConverter)
package com.iflytek.conversion;
import java.awt.Point;
import java.util.Map;
import org.apache.struts2.util.StrutsTypeConverter;
/**
* @author xudongwang 2011-10-31
*
*/
public class MyPointConverter extends StrutsTypeConverter {
@Override
public Object convertFromString(Map context, String[] values, Class toClass) {
Point p = new Point();
String[] strs = (String[]) values;
String[] xy = strs[0].split(",");
p.x = Integer.parseInt(xy[0]);
p.y = Integer.parseInt(xy[1]);
return p;
}
@Override
public String convertToString(Map context, Object o) {
return o.toString();
}
}
or
MyPointConverter02.java( 继承DefaultTypeConverter)
package com.iflytek.conversion;
import java.awt.Point;
import java.util.Map;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
/**
* @author xdwang 2012-6-25
*
*/
public class MyPointConverter02 extends DefaultTypeConverter {
public Object convertValue(Map<String, Object> context, Object value,
Class toType) {
if (toType == Point.class) {
Point point = new Point();
String[] temps = (String[]) value;
String[] params = temps[0].split(",");
int x = Integer.parseInt(params[0]);
int y = Integer.parseInt(params[1]);
point.x = x;
point.y = y;
return point;
} else if (String.class == toType) {
Point point = (Point) value;
return point.getX() + "," + point.getY();
}
return null;
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<constant name="struts.ui.theme" value="simple" />
<package name="tags" extends="struts-default">
<action name="test" class="com.iflytek.action.TestAction">
<result>/test.jsp</result>
</action>
</package>
</struts>
web.xml ：
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- 过滤器 --> <filter> <filter-name>encoding</filter-name> <filter-class>com.iflytek.filter.EncodingFilter</filter-class> </filter> <filter-mapping> <filter-name>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter> <filter-name>struts2</filter-name> <!-- 新的 --> <!-- <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> --> <!-- 旧的 --> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
xwork-conversion.properties （放在src 下）
java.awt.Point=com.iflytek.conversion.MyPointConverter02
test.jsp ：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <%@taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'test.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> name: <s:property value="name" /> <br> age: <s:property value="age" /> <br> date: <s:property value="date" /> <br> <s:date name="date" format="yyyy/MM/dd HH:mm:ss"/><br/> <s:property value="p"/><br/> </body> </html>
启动服务后，直接在地址栏输入：
http://localhost:8080/Struts2.2_TypeConversion/test?name=2&age=1&date=1988-09-09&p=3,2
页面显示：
name: 2
age: 1
date: 88-9-9
1988/09/09 00:00:00
3.0,2.0